Study of spin dependent transport processes in organic solar cells

• Grant number: 11/21830-6
• Support type: Scholarships in Brazil - Doctorate
• Effective date (Start): July 01, 2012
• Effective date (End): April 30, 2016
• Field of knowledge: Physical Sciences and Mathematics - Physics - Condensed Matter Physics
• Principal Investigator: Carlos Frederico de Oliveira Graeff
• Grantee: Oswaldo Nunes Neto
• Home Institution: Faculdade de Ciências (FC). Universidade Estadual Paulista (UNESP). Campus de Bauru. Bauru , SP, Brazil
• Associated research grant: 08/57872-1 - National Institute for Materials Science in Nanotechnology, AP.TEM

Abstract

This project aims to study the photo-excitation, recombination, dissociation and charges transport processes in highly original organic solar cells, based on thin films of Near Infrared (NIR) absorbing ionic dyes of the Cyanine class. A significant increase on the efficiency in converting solar energy into electricity is expected in these devices, since their physicochemical constitutions and architectures will be designed to broaden the spectrum of optical absorption. More specifically, it is intended to approximate the absorption band of solar cells for the near infrared, since this range includes a large portion of the intensity of solar energy. This project is linked to the project "Organic thin film solar cells based on near infrared absorbing colorants - BSJRP/CNPq", which is a bilateral cooperation between Brazil and Switzerland. Such partnership will show enriching for both parts. The Swiss group has the experience in the synthesis process and the engineering of these new photovoltaic devices, and, on the other hand, the Brazilian group has the knowledge on the characterization of spin dependent transport and recombination process in organic materials. For the purpose of this project, the characterizations will be performed on precursor materials and with mentioned devices by using sophisticated techniques for spin dependent transport phenomena study. Some of these techniques will be: Electron Spin Resonance, Light-Induced Electron Spin Resonance, Electrically Detected Magnetic Resonance and Electrical Impedance Spectroscopy with and without the presence of external magnetic field.

Scientific publications

(4)

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

ALBANO, LUIZ G. S.; BORATTO, MIGUEL H.; NUNES-NETO, OSWALDO; GRAEFF, CARLOS F. O. Low voltage and high frequency vertical organic field effect transistor based on rod-coating silver nanowires grid electrode. ORGANIC ELECTRONICS, v. 50, p. 311-316, NOV 2017. Web of Science Citations: 10.

NUNES-NETO, OSWALDO; BATAGIN-NETO, AUGUSTO; LEITE, DOUGLAS M. G.; NUESCH, FRANK A.; GRAEFF, CARLOS F. O. Magnetic field effects in Alq(3)-based OLEDs investigated by electrical impedance spectroscopy. ORGANIC ELECTRONICS, v. 50, p. 347-358, NOV 2017. Web of Science Citations: 4.

CONGIU, M.; NUNES-NETO, O.; DE MARCO, M. L.; DINI, D.; GRAEFF, C. F. O. Cu2-xS films as counter-electrodes for dye solar cells with ferrocene-based liquid electrolytes. Thin Solid Films, v. 612, p. 22-28, AUG 1 2016. Web of Science Citations: 14.

LEITE, D. M. G.; BATAGIN-NETO, A.; NUNES-NETO, O.; GOMEZ, J. A.; GRAEFF, C. F. O. Electrically detected magnetic resonance modeling and fitting: An equivalent circuit approach. Journal of Applied Physics, v. 115, n. 3 JAN 21 2014. Web of Science Citations: 0.

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

NETO, Oswaldo Nunes. Estudo dos processos de transporte dependentes de Spin em materiais orgânicos. 2016. 172 f. Doctoral Thesis - Universidade Estadual Paulista (Unesp) Faculdade de Ciências.